Look, I think the Wakanda Design Group should be responsible for much of the Wakandan gear. I love the Wakanda Design Group (shot out to Busiek for creating it).
I also feel it would be a good idea for either T'Challa to have a close hand on his OWN PERSONAL GEAR or a Wakandan he can completely trust (like Shuri or Taku). To keep the tech/design safe and out of the wrong hands.